Rust is a common electrochemical corrosion problem regularly faced by the palm oil industry but most millers and refiners have shown only lukewarm interest in taking serious steps to control rust in the mill machinery especially the storage tanks. Metals act as catalysts in the oxidation reaction where palm free fatty acids react with the iron from the bare metal surfaces to produce oil soluble metallic soaps that will eventually result in pitting on the inner tank surfaces. This in turn leads in oil quality deterioration in a relatively short period of time. The most common and effective way to prevent corrosion is to isolate the metal surfaces from electrolyte by keeping the surface dry and by applying a protective film coating like epoxy coating, epoxy phenolic coating or linseed oil. Proprietary rust treatment formulae may provide appropriate solution but tend to be rather expensive due to the fact that such formulations often comprise inexpensive common chemicals. Commercial rust converters usually are waterbased primer which contain tannic acid or phosphoric acid and an organic polymer usually 2-butoxyethanol that can be applied directly to a rusty surface without bringing the surface down to bare metal. The use is not practical because the accurate thickness and composition of the rust film is impossible to determine. Generally, increased corrosion resistance can only be obtained at an increased cost.